From f7d8e706f135d79dda94cc8fdf5a0c1f3c1b1a28 Mon Sep 17 00:00:00 2001
From: Jason Nelson <jason@carbonmade.com>
Date: Thu, 22 Mar 2018 18:55:08 -0700
Subject: [PATCH] Pass ColorSpace types by readonly ref

---
 src/ImageSharp/ColorSpaces/Conversion/IColorConversion.cs   | 6 ++++--
 .../Implementation/CieLab/CieLabToCieXyzConverter.cs        | 2 +-
 .../Implementation/CieLab/CieXyzToCieLabConverter.cs        | 4 ++--
 .../Implementation/CieLch/CIeLchToCieLabConverter.cs        | 2 +-
 .../Implementation/CieLch/CieLabToCieLchConverter.cs        | 2 +-
 .../Implementation/CieLchuv/CieLchuvToCieLuvConverter.cs    | 3 +--
 .../Implementation/CieLchuv/CieLuvToCieLchuvConverter.cs    | 2 +-
 .../Implementation/CieLuv/CieLuvToCieXyzConverter.cs        | 3 +--
 .../Implementation/CieLuv/CieXyzToCieLuvConverter.cs        | 4 ++--
 .../Implementation/CieXyy/CieXyzAndCieXyyConverter.cs       | 4 ++--
 .../Conversion/Implementation/Cmyk/CmykAndRgbConverter.cs   | 4 ++--
 .../Conversion/Implementation/Hsl/HslAndRgbConverter.cs     | 4 ++--
 .../Conversion/Implementation/Hsv/HsvAndRgbConverter.cs     | 5 ++---
 .../Implementation/HunterLab/CieXyzToHunterLabConverter.cs  | 4 ++--
 .../Implementation/HunterLab/HunterLabToCieXyzConverter.cs  | 2 +-
 .../Conversion/Implementation/Lms/CieXyzAndLmsConverter.cs  | 5 ++---
 .../Implementation/Rgb/CieXyzToLinearRgbConverter.cs        | 2 +-
 .../Implementation/Rgb/LinearRgbToCieXyzConverter.cs        | 2 +-
 .../Implementation/Rgb/LinearRgbToRgbConverter.cs           | 2 +-
 .../Implementation/Rgb/RgbToLinearRgbConverter.cs           | 2 +-
 .../Conversion/Implementation/YCbCr/YCbCrAndRgbConverter.cs | 5 ++---
 21 files changed, 33 insertions(+), 36 deletions(-)

diff --git a/src/ImageSharp/ColorSpaces/Conversion/IColorConversion.cs b/src/ImageSharp/ColorSpaces/Conversion/IColorConversion.cs
index 9ef24b38af..19feeaa5da 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/IColorConversion.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/IColorConversion.cs
@@ -8,13 +8,15 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion
     /// </summary>
     /// <typeparam name="T">The input color type.</typeparam>
     /// <typeparam name="TResult">The result color type.</typeparam>
-    internal interface IColorConversion<in T, out TResult>
+    internal interface IColorConversion<T, TResult>
+        where T: struct
+        where TResult: struct
     {
         /// <summary>
         /// Performs the conversion from the input to an instance of the output type.
         /// </summary>
         /// <param name="input">The input color instance.</param>
         /// <returns>The converted result</returns>
-        TResult Convert(T input);
+        TResult Convert(in T input);
     }
 }
\ No newline at end of file
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLab/CieLabToCieXyzConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLab/CieLabToCieXyzConverter.cs
index 0a5ae3627e..15f50971a1 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLab/CieLabToCieXyzConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLab/CieLabToCieXyzConverter.cs
@@ -13,7 +13,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLabColor
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieXyz Convert(CieLab input)
+        public CieXyz Convert(in CieLab input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLab/CieXyzToCieLabConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLab/CieXyzToCieLabConverter.cs
index 22308260c2..cdeda7f785 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLab/CieXyzToCieLabConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLab/CieXyzToCieLabConverter.cs
@@ -26,7 +26,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLabColor
         /// </summary>
         /// <param name="labWhitePoint">The target reference lab white point</param>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieXyzToCieLabConverter(CieXyz labWhitePoint)
+        public CieXyzToCieLabConverter(in CieXyz labWhitePoint)
         {
             this.LabWhitePoint = labWhitePoint;
         }
@@ -42,7 +42,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLabColor
 
         /// <inheritdoc />
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieLab Convert(CieXyz input)
+        public CieLab Convert(in CieXyz input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLch/CIeLchToCieLabConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLch/CIeLchToCieLabConverter.cs
index 35fae30e83..fcc8687fba 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLch/CIeLchToCieLabConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLch/CIeLchToCieLabConverter.cs
@@ -14,7 +14,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLchColor
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieLab Convert(CieLch input)
+        public CieLab Convert(in CieLch input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLch/CieLabToCieLchConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLch/CieLabToCieLchConverter.cs
index aa4614f9ca..134cc1a08f 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLch/CieLabToCieLchConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLch/CieLabToCieLchConverter.cs
@@ -14,7 +14,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLchColor
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieLch Convert(CieLab input)
+        public CieLch Convert(in CieLab input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLchuv/CieLchuvToCieLuvConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLchuv/CieLchuvToCieLuvConverter.cs
index fc6554a905..2cbb953b8c 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLchuv/CieLchuvToCieLuvConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLchuv/CieLchuvToCieLuvConverter.cs
@@ -3,7 +3,6 @@
 
 using System;
 using System.Runtime.CompilerServices;
-using SixLabors.ImageSharp.ColorSpaces;
 
 namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLchuvColorSapce
 {
@@ -14,7 +13,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLchuvCol
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieLuv Convert(CieLchuv input)
+        public CieLuv Convert(in CieLchuv input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLchuv/CieLuvToCieLchuvConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLchuv/CieLuvToCieLchuvConverter.cs
index f0d7a80a22..427fb8f836 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLchuv/CieLuvToCieLchuvConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLchuv/CieLuvToCieLchuvConverter.cs
@@ -14,7 +14,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLchuvCol
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieLchuv Convert(CieLuv input)
+        public CieLchuv Convert(in CieLuv input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLuv/CieLuvToCieXyzConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLuv/CieLuvToCieXyzConverter.cs
index 50e8335ed6..03eddab449 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLuv/CieLuvToCieXyzConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLuv/CieLuvToCieXyzConverter.cs
@@ -3,7 +3,6 @@
 
 using System;
 using System.Runtime.CompilerServices;
-using SixLabors.ImageSharp.ColorSpaces;
 
 namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLuvColorSapce
 {
@@ -14,7 +13,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLuvColor
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieXyz Convert(CieLuv input)
+        public CieXyz Convert(in CieLuv input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLuv/CieXyzToCieLuvConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLuv/CieXyzToCieLuvConverter.cs
index 709d8d426e..162f5b9c24 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLuv/CieXyzToCieLuvConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieLuv/CieXyzToCieLuvConverter.cs
@@ -26,7 +26,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLuvColor
         /// </summary>
         /// <param name="luvWhitePoint">The target reference luv white point</param>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieXyzToCieLuvConverter(CieXyz luvWhitePoint)
+        public CieXyzToCieLuvConverter(in CieXyz luvWhitePoint)
         {
             this.LuvWhitePoint = luvWhitePoint;
         }
@@ -42,7 +42,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieLuvColor
 
         /// <inheritdoc />
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieLuv Convert(CieXyz input)
+        public CieLuv Convert(in CieXyz input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieXyy/CieXyzAndCieXyyConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieXyy/CieXyzAndCieXyyConverter.cs
index 64fc84b1d4..ef9672d6cd 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieXyy/CieXyzAndCieXyyConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/CieXyy/CieXyzAndCieXyyConverter.cs
@@ -15,7 +15,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieXyyColor
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieXyy Convert(CieXyz input)
+        public CieXyy Convert(in CieXyz input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
@@ -32,7 +32,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CieXyyColor
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieXyz Convert(CieXyy input)
+        public CieXyz Convert(in CieXyy input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Cmyk/CmykAndRgbConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Cmyk/CmykAndRgbConverter.cs
index 404bc811ff..be4be5e655 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Cmyk/CmykAndRgbConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Cmyk/CmykAndRgbConverter.cs
@@ -14,7 +14,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CmykColorSa
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Rgb Convert(Cmyk input)
+        public Rgb Convert(in Cmyk input)
         {
             float r = (1F - input.C) * (1F - input.K);
             float g = (1F - input.M) * (1F - input.K);
@@ -25,7 +25,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.CmykColorSa
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Cmyk Convert(Rgb input)
+        public Cmyk Convert(in Rgb input)
         {
             // To CMYK
             float c = 1F - input.R;
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Hsl/HslAndRgbConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Hsl/HslAndRgbConverter.cs
index 3de3baddd3..597e571a8d 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Hsl/HslAndRgbConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Hsl/HslAndRgbConverter.cs
@@ -15,7 +15,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.HslColorSap
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Rgb Convert(Hsl input)
+        public Rgb Convert(in Hsl input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
@@ -48,7 +48,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.HslColorSap
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Hsl Convert(Rgb input)
+        public Hsl Convert(in Rgb input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Hsv/HsvAndRgbConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Hsv/HsvAndRgbConverter.cs
index 6219533ca5..443252a63d 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Hsv/HsvAndRgbConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Hsv/HsvAndRgbConverter.cs
@@ -3,7 +3,6 @@
 
 using System;
 using System.Runtime.CompilerServices;
-using SixLabors.ImageSharp.ColorSpaces;
 
 namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.HsvColorSapce
 {
@@ -15,7 +14,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.HsvColorSap
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Rgb Convert(Hsv input)
+        public Rgb Convert(in Hsv input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
@@ -80,7 +79,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.HsvColorSap
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Hsv Convert(Rgb input)
+        public Hsv Convert(in Rgb input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/HunterLab/CieXyzToHunterLabConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/HunterLab/CieXyzToHunterLabConverter.cs
index 7faf03c9a1..f13155120b 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/HunterLab/CieXyzToHunterLabConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/HunterLab/CieXyzToHunterLabConverter.cs
@@ -26,7 +26,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.HunterLabCo
         /// </summary>
         /// <param name="labWhitePoint">The hunter Lab white point.</param>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieXyzToHunterLabConverter(CieXyz labWhitePoint)
+        public CieXyzToHunterLabConverter(in CieXyz labWhitePoint)
         {
             this.HunterLabWhitePoint = labWhitePoint;
         }
@@ -42,7 +42,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.HunterLabCo
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public HunterLab Convert(CieXyz input)
+        public HunterLab Convert(in CieXyz input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/HunterLab/HunterLabToCieXyzConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/HunterLab/HunterLabToCieXyzConverter.cs
index 7e7c536e3f..d62eba30bb 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/HunterLab/HunterLabToCieXyzConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/HunterLab/HunterLabToCieXyzConverter.cs
@@ -14,7 +14,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.HunterLabCo
     {
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieXyz Convert(HunterLab input)
+        public CieXyz Convert(in HunterLab input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Lms/CieXyzAndLmsConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Lms/CieXyzAndLmsConverter.cs
index 780c9e5a6e..83a64d3d0a 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Lms/CieXyzAndLmsConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Lms/CieXyzAndLmsConverter.cs
@@ -3,7 +3,6 @@
 
 using System.Numerics;
 using System.Runtime.CompilerServices;
-using SixLabors.ImageSharp.ColorSpaces;
 
 namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.LmsColorSapce
 {
@@ -61,7 +60,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.LmsColorSap
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Lms Convert(CieXyz input)
+        public Lms Convert(in CieXyz input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
@@ -71,7 +70,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.LmsColorSap
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public CieXyz Convert(Lms input)
+        public CieXyz Convert(in Lms input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/CieXyzToLinearRgbConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/CieXyzToLinearRgbConverter.cs
index fd76a30fb8..9c02aacaaf 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/CieXyzToLinearRgbConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/CieXyzToLinearRgbConverter.cs
@@ -36,7 +36,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.RgbColorSap
         public IRgbWorkingSpace TargetWorkingSpace { get; }
 
         /// <inheritdoc/>
-        public LinearRgb Convert(CieXyz input)
+        public LinearRgb Convert(in CieXyz input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/LinearRgbToCieXyzConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/LinearRgbToCieXyzConverter.cs
index bf36e252a2..23625fc024 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/LinearRgbToCieXyzConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/LinearRgbToCieXyzConverter.cs
@@ -36,7 +36,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.RgbColorSap
         public IRgbWorkingSpace SourceWorkingSpace { get; }
 
         /// <inheritdoc/>
-        public CieXyz Convert(LinearRgb input)
+        public CieXyz Convert(in LinearRgb input)
         {
             DebugGuard.NotNull(input, nameof(input));
             DebugGuard.IsTrue(input.WorkingSpace.Equals(this.SourceWorkingSpace), nameof(input.WorkingSpace), "Input and source working spaces must be equal.");
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/LinearRgbToRgbConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/LinearRgbToRgbConverter.cs
index 29ea0f3148..e746b40c59 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/LinearRgbToRgbConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/LinearRgbToRgbConverter.cs
@@ -11,7 +11,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.RgbColorSap
     internal class LinearRgbToRgbConverter : IColorConversion<LinearRgb, Rgb>
     {
         /// <inheritdoc/>
-        public Rgb Convert(LinearRgb input)
+        public Rgb Convert(in LinearRgb input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/RgbToLinearRgbConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/RgbToLinearRgbConverter.cs
index e40ecc192e..af2c39f0f6 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/RgbToLinearRgbConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/Rgb/RgbToLinearRgbConverter.cs
@@ -11,7 +11,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.RgbColorSap
     internal class RgbToLinearRgbConverter : IColorConversion<Rgb, LinearRgb>
     {
         /// <inheritdoc/>
-        public LinearRgb Convert(Rgb input)
+        public LinearRgb Convert(in Rgb input)
         {
             Guard.NotNull(input, nameof(input));
 
diff --git a/src/ImageSharp/ColorSpaces/Conversion/Implementation/YCbCr/YCbCrAndRgbConverter.cs b/src/ImageSharp/ColorSpaces/Conversion/Implementation/YCbCr/YCbCrAndRgbConverter.cs
index f552acbb48..548fe6128e 100644
--- a/src/ImageSharp/ColorSpaces/Conversion/Implementation/YCbCr/YCbCrAndRgbConverter.cs
+++ b/src/ImageSharp/ColorSpaces/Conversion/Implementation/YCbCr/YCbCrAndRgbConverter.cs
@@ -4,7 +4,6 @@
 using System;
 using System.Numerics;
 using System.Runtime.CompilerServices;
-using SixLabors.ImageSharp.ColorSpaces;
 
 namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.YCbCrColorSapce
 {
@@ -18,7 +17,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.YCbCrColorS
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public Rgb Convert(YCbCr input)
+        public Rgb Convert(in YCbCr input)
         {
             DebugGuard.NotNull(input, nameof(input));
 
@@ -35,7 +34,7 @@ namespace SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.YCbCrColorS
 
         /// <inheritdoc/>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public YCbCr Convert(Rgb input)
+        public YCbCr Convert(in Rgb input)
         {
             DebugGuard.NotNull(input, nameof(input));